In a fast food confession to New York Magazine, the 44-year-old actress is recounting an incident in which she and fiancé Justin Theroux found themselves eating the burger chain's signature meal.

"I'll never forget when Justin and I were on a road trip and we were so hungry," Aniston says. "The only thing around was McDonald's. I think I ordered a Big Mac. Wow, my body did not react well to that! It was like putting gasoline in a purified system. I am always trying to eat organic and natural foods, so that just made my stomach turn and made me feel terrible. And I think what you put in your body, as well as stress, is reflected in the quality of your skin."

Aniston recovered from the Big Mac blunder and is giving advice on how to get her gorgeous glowing skin. She dished, "I can never stress enough to my friends that they must do as I do...hydrate, hydrate, hydrate! Drink lots of water, get enough sleep, exercise, and eat a clean healthy diet, whenever possible."

As for her daily skincare routine, Aniston tells the mag, "The skin care rule I stand by is simply cleanse, tone, and moisturize. I also try to exfoliate pretty regularly. A while back I was doing a movie in the summer heat. Long days with a face full of makeup made my skin react badly. My makeup artist on set did a great thing, she gave me a tube of Aveeno Positively Radiant Daily Scrub to use every night. And I've been using it ever since."

And Aniston always has her essential beauty products in her bag to make sure she looks red carpet ready. Some of her favorites?

Aniston admits to having on hand Estée Lauder Fig lip liner ("I've been using that pencil forever," she says), Dr. Hauschka lip balm, La Femme pencil concealer ("one side is a concealer and the other is a highlighter") and, of course, a bottle of her Jennifer Aniston fragrance.

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